Double swirl chamber swirlers

1. A swirler for swirling fluid in a nozzle comprising:

a swirler body defining:

an inlet end;

an outlet end opposed to the inlet end; and

a circumferential periphery extending axially from the inlet end to the outlet end, wherein the outlet end defines a first swirl chamber with an axial depth, wherein the inlet end defines a second swirl chamber with an axial depth, wherein the axial depth of the first swirl chamber is equivalent to the axial depth of the second swirl chamber; and

a first configuration wherein the second swirl chamber is adjacent the outlet end, and further comprising a first cap having a first chamber insert to mate with the first swirl chamber, the first cap closing off the first swirl chamber from a flow of fluid traversing the swirler body; and

a second configuration wherein the first swirl chamber is adjacent the outlet end, and further comprising a second cap having a second chamber insert to mate with the second swirl chamber, the second cap closing off the second swirl chamber from a flow of fluid traversing the swirler body.

2. A swirler as recited in claim 1 , further comprising a feed channel defined in the circumferential periphery from the inlet end to the outlet end of the swirler body.

3. A swirler as recited in claim 2 , wherein the first swirl chamber is in fluid communication with the feed channel for supplying fluid from the feed channel to be swirled in the first swirl chamber.

4. A swirler as recited in claim 3 , further comprising a tangential swirl slot defined in the outlet end of the swirler body placing the feed channel in fluid communication with the first swirl chamber and for imparting swirl on fluid fed into the first swirl chamber.

5. A swirler as recited in claim 4 , wherein the tangential swirl slot includes a metering orifice for metering flow into the first swirl chamber.

6. A swirler as recited in claim 2 , wherein the first and second swirl chambers are both in fluid communication with the feed channel for supplying fluid from the feed channel to be swirled in at least one of the swirl chambers.

7. A swirler as recited in claim 6 , further comprising:

a first tangential swirl slot defined in the outlet end of the swirler body placing the feed channel in fluid communication with the first swirl chamber and for imparting swirl on fluid fed into the first swirl chamber; and

a second tangential swirl slot defined in the inlet end of the swirler body placing the feed channel in fluid communication with the second swirl chamber and for imparting swirl on fluid fed into the second swirl chamber.

8. A swirler as recited in claim 7 , wherein each tangential swirl slot includes a metering orifice for metering flow therethrough.

9. A swirler as recited in claim 7 , wherein the first swirl chamber is configured to swirl fluid in a clockwise direction about the swirler axis, wherein the second swirl chamber is configured to swirl fluid in a counterclockwise direction about the swirler axis, and wherein the tangential swirl slots are angled to provide counter-clockwise swirl in one of the first and second swirl chambers and clockwise swirl in the other of the first and second swirl chambers.

10. A spray nozzle, comprising:

a nozzle body defining an interior bore extending from an inlet to an opposed outlet, with an interior locating surface defined in the interior bore;

a swirler as recited in claim 1 disposed within the interior bore engaged with the locating surface with the first swirl chamber positioned proximate the outlet of the nozzle body; and

an orifice disc disposed within the interior bore between the swirler and the outlet of the nozzle body, wherein the orifice disc defines an orifice therethrough in fluid communication with the swirl chamber and the outlet of the nozzle body for issuing a swirling spray from the nozzle body outlet.

11. A spray nozzle as recited in claim 10 , further comprising a locking member engaged within the interior bore for locking the swirl element and orifice disc within the interior bore, the locking member defining a flow passage from the inlet of the nozzle body to the channel of the swirl element.

12. A spray nozzle as recited in claim 10 , further comprising a feed channel defined in the circumferential periphery from the inlet end to the outlet end of the swirler body.

13. A spray nozzle as recited in claim 12 , wherein the feed channel defines a channel surface with an arcuate cross-section, wherein the interior bore is circular, and wherein the channel surface and the interior bore define a flow passage with a biconvex lens shaped cross-section.

14. A spray nozzle as recited in claim 12 , wherein the first swirl chamber is in fluid communication with the feed channel for supplying fluid from the feed channel to be swirled in the first swirl chamber.

15. A spray nozzle as recited in claim 12 , wherein the first and second swirl chambers are both in fluid communication with the feed channel for supplying fluid from the feed channel to be swirled in at least one of the swirl chambers.

16. A spray nozzle as recited in claim 13 , wherein each of the first and second caps defines a lunate cutout corresponding to the flow passage cross-section.

17. A kit comprising:

a spray nozzle including:

a nozzle body defining an interior bore extending from an inlet to an opposed outlet, with an interior locating surface defined in the interior bore;

a swirler as recited in claim 1 configured to be disposed within the interior bore engaged with the locating surface with the first swirl chamber positioned proximate the outlet of the nozzle body;

an orifice disc configured to be disposed within the interior bore between the swirler and the outlet of the nozzle body, wherein the orifice disc defines an orifice therethrough for fluid communication with the swirl chamber and the outlet of the nozzle body for issuing a swirling spray from the nozzle body outlet,

wherein the first cap is configured to be disposed within the interior bore and engaged with the inlet end of the swirler body for closing off the first swirl chamber, wherein the first cap defines a lunate cutout,

wherein the second cap is configured to be disposed within the interior bore and engaged with the inlet end of the swirler body for closing off the second swirl chamber, wherein the second cap defines a lunate cutout.